make full use of the time in the class. I take notes of the important points of every class. I do not talk about anything that has nothing to do with the class. More importantly, I pay all my attention to the class and listen to the teacher carefully. critical study is also very important. It means that we should not accept anything blindly and with careful thought. Everything is not absolutely correct in the world and everything is changing. We can find many answers to a question. If we think critically, we may find many possibilities to solve a problem....